Zoom type anamorphic eyepiece



x WV/Q, X WYH W NOV. 12, 1968 v, J CARPENTER ET AL 3,410,629

ZOOM TYPE ANAMORPHIC EYEPIECE Filed March 26, 1965 FIG. 2

INVENTORS I VANCE J. CARPENTER k 5 JOHN M. SIMPSON JR.

GEORGE E ZIEGLER AT TOR NEY United States Patent Ofice 3,410,629 Patented Nov. 12, 1968 3,410,629 ZOOM TYPE ANAMORPHIC EYEPIE'CE Vance J. Carpenter, Irondequoit, John M. Simpson, Jr.,

Chili, and George F. Ziegler, Gates, N.Y., assignors to Bausch & Lomb Incorporated, Rochester, N.Y., a corporation of New York Filed Mar. 26, 1965, Ser. No. 442,928

7 Claims. (Cl. 350-181) ABSTRACT OF THE DISCLOSURE A zoom type of anamorphic eyepiece having a variable power cylindrical lens system for varia-bly anamorphosing the image in one lateral direction, the system being an afocal type and being located between fixed front and rear relay lens systems.

The present invention relates to an anamorphic eyepiece for scientific instruments such as microscopes, etc., and more particularly it relates to a zoom type of anamor-phic eyepiece.

Problems of matching two similar objects to be viewed simultaneously have arisen in the use of comparison microscopes and particularly in photogrammetry wherein pictures of the same area of terrain, which are taken at different camera angles, must be anamorphosed in one direction. In a photogrammetric stereo-viewer, it is often helpful, as above mentioned, to hold two pictures of the same area in the respective stereo fields of view of a stereo-viewer and anamorphose one of the dimensions of one of the pictures so that these pictures will serve as a stereo pair which will form an accurate stereo image in the field of view.

In view of the foregoing, it is an object of the present invention to provide a novel zoom type of anamorphosing eyepiece which may be substituted for the conventional microscope eyepiece in comparison microscopes such as photogrammetric stereo-viewers, said anamorphosing eyepiece serving to variably adjust the magnification of the image of an object along only one meridian or direction in the field of view.

It is a further object to provide such a device wherein the degree of the anamorphosing effect on said image is produced and controlled by a zoom type of cylindrical lens system preferably of the mechanically compensated type whereby an image of excellent optical quality may be produced in all parts of the range of magnification of said zoom system.

Further objects and advantages of the present invention will be" apparent in the details and arrangement of its parts and in the combinations thereof, reference being had to the following specification and accompanying drawing for a full description and illustration of the invention.

In the drawings:

FIG. 1 is an optical diagram showing the component parts of the entire anamorphosing zoom lens system in one operating position; and

FIG. 2 is an enlarged optical diagram similar to FIG. 1 showing only the lower part of the optical system.

With reference to FIG. 1 of the drawing, an optical system in the form of an anamorphic zoom type eyepiece is represented generally by the numeral 10, this device being substituted in place of the conventional eyepiece in a microscope, not shown, having a mounting shoulder M whereon the eyepiece is seated.

Comprised in said anamorphic eyepiece 10 is a front relay lens system 11 which is focused at the usual forwardly located eyepiece focal plane, not shown, an anamorphic zoom lens system generally designated 12, a

rear relay lens system 13, and an eyepiece 14 of preferred optical properties, all components of which are arranged in optical alignment on an axis 15. It is contemplated to use two duplicate optical systems 10 in a stereo-microscope type of photogrammetric instrument, and for such a purpose, a deviation prism shown tentatively by dotted lines at 16 is provided so that the interpupillary distance may be adjusted to the needs of the observer.

The anamorphic zoom lens system 12 is advantageously designed to work in collimated light so that in the meridian or axial plane which lies normal to the plane of the drawing, the magnification of the image is 1:1. In the axial plane or meridian which lies in the plane of the drawing, the magnification of the image is varied through a range from 1:1 up to at least 112.7 8 measured in the focal plane 17 of the eyepiece 14.

Consequently, the front and rear relay lens systems 11 and 13 respectively are spaced at a distance equal to their respective focal lengths from their respective focal planes and said focal lengths are substantially equal to each other. It is also important to choose the focal lengths of said front and rear relay lenses 11 and 13 long enough to minimize the angular field but nevertheless short as possible to reduce the overall length of the optical system 10. It has been discovered that said focal lengths of the relay lens systems should preferably be substantially 50 mm. for the form of the invention here disclosed. Using such a focal length, the front relay system 10 transmits parallel light to the anamorphic system 12 and the rear relay system receives parallel light from system 12 in one meridian only or the single plane which includes all of the axes of every cylindrical surface.

With respect to the constructional forms of the lens parts in said system 10, the front relay lens system 11 comprises a front singlet positive lens member I and a rear doublet positive lens member II which are spaced from each other by an axial distance 8,, the lens members I and II preferably being plano-convex in form and having the plano surfaces turned away from each other. Lens member II includes a front double convex lens element which lies in contact with a concave-plano lens element at the rear. The front surface of lens member I is located at a distance at having a value which is .606F a .670F forwardly from said mounting shoulder M where F represents the focal length of said front relay lens system 11.

The anamorphic zoom system 12 magnifies the transmitted image in one meridian from 1:1 to 2.78 as above stated, and is composed entirely of cylindrical lenses which are all oriented in the same direction so as to have a common axial plane of unity magnification, i.e., all the refractive cylindrical surfaces on said lenses extend in the same direction and are symmetrical with respect to said common plane of unity magnification. By the above definition, the cylindrical axis of each of said cylindrical surfaces lies in a common axial plane which is the plane of unity magnification.

Comprised in said anamorphic zoom system 12 is a front positive singlet lens member HI preferably of planoconvex form, the plano surface facing rearwardly. Lens member III is spaced at an axial distance S rearwardly of lens member II as shown in FIG. 2 and the space is large enough to accommodate a deviation wedge 16 shown in dotted lines. Lens member HI is stationary and a second positive lens member V is located at a fixed position rearwardly thereof. Between positive lens members III and V a movable singlet negative lens member IV is spaced and rearwardly of lens member V a second movable negative singlet lens member VI is located, the movable lens members IV and VI being dilferentially moved relative to said stationary lens members HI and V in such a manner as to continuously vary the magnification of the transmitted image in one meridian or plane only as aforesaid, the image remaining at a substantially stationary position on the optical axis during the motion of the lens members IV and VI. Preferably, the positive lens member V is composed of a front and a rear double convex lens, the lens surfaces of steeper curvature in each lens facing each other.

The variable axial space between lens members III and IV is designated S and between lens members IV and V the variable space is designated 8., while the fixed space between the front and rear elements of lens member V is designated S The variable axial space between lens members V and VI is designated S and the variable space rearwardly of member VI is designated S Spaced at the variable axial distance S7 from member VI is the aforesaid rear relay lens system 13 comprising a front double convex singlet lens member designated VII and a doublet lens member VIII, these members being spaced apart by a fixed axial distance designated S Lens member VIII is composed of a front double convex lens element which is cemented to a rear preferably plane-concave lens element. The parallel rays entering the rear relay system 13 are brought to a focus forming a real image at a focal plane 17 as aforesaid, the distance therebetween being designated 8,, and the eyepiece 14 is provided for viewing said image. Various eyepieces 14 may be used depending on the magnification, size of field, eye relief and state of correction of aberrations desired by the observer.

The axial thicknesses of the successive lens members I to VIII and their component lens elements are designated to For the attainment of the objects of the present invention, the constructional properties and data should have values as stated in Table I herebelow stated in terms of F which represents the focal length of the front relay lens system 11, the focal lengths of the successive lens members I to VIII being represented by F to F said air spaces S to S and said lens thicknesses t to t also being included, considering the movable lens members IV and VI to be in unity magnification position.

wherein the minus sign used with the F to F designations means negative focal length.

A further specification of the constructional data of the lens members I to VIII is given in Table II for the lens radii which are designated R to R and are given in terms of F, the accompanying minus sign meaning that the surface is concave toward entrant light. Table II further specifies the values for the refractive index of the glass in the successive lens elements, the designations therefor being 21;; (I), n;, (II pos.), n (II neg.), n (III), n (IV), 12;, (V front), n;, (V rear), n (VI), 11;, (VII), n (VIII pos.), 12;, (VIII neg), and also specifies the values for Abb number u for said elements by the designations, v (I), v (II pos.), 11 (II neg.), 1 (Ill), 11 (IV), I! (V front), I/ (V rear), v (VI), v (VII), 1 (VIII pos.), :1 (VIII neg).

4 TABLE II are given in the consolidated Table III wherein the designations remain the same.

Footnote at end of table.

TABLE a rear relay spherical lens system optically aligned with n (VI)==l.720 v (VII)=58.4 and spaced rearwardly from said zoom system at a m; (VII)=1.651 11 (VIII pos.)=70.0 fixed position so as to receive collimated light theren (VIII pos.)=1.514 v (VIII neg.)=27.8 from, said rear relay lens system forming a real 1mn (VIII neg.)==1.751 age rearwardly thereof and having a focal length F =L369F which is substantially equal to the focal length of v (1) =48.0 F =.722F the front relay lens system, and v (II pos.)=60.3 F =.956F means for viewlng said real image v (II neg.)=36.2 F ==.291F whereby the image formed by said microscope ob ecv (III)=58.4 F =.348F tive is varied in one mer1d1an by the anamorphosmg v (IV) =42.0 F =.444F lens system in a continuous manner. I v (V front)=56.9 F =l.466F 2. An anamorphic zoom eyepiece according to claim 1/ (V rear)=56.9 F =2.544F 1 wherein the focal length of both front and rear relay (VI) :36} lens systems is substantially 50 mm. 1 For unity magnification 15 3. An anamorphic zoom eyepiece according to claim 2 further characterized by Particularly with regard to the variable air Spaces S3 said front relay lens system being composed of a front to S the specific values thereof for a progression of image magnifications within the range of .995 X to 2.781 X are given in Table IV herebelow in terms of F.

each other, said doublet including a double convex lens element on its front side which has a curvature weaker than its interface curvature, the focal length of the doublet being substantially .53 times the focal length of said singlet,

TABLE IV said rear relay lens system being composed of a front S S S 87 double convex singlet lens of symmetrical form which Magmficam 3 6 is closely spaced from a rear doublet lens, said dou- -832; 82%; 13328? blet lens having a focal length which is substantially 1I1e2 0709F 2142B 2235: .2633? l.74 times the focal length of said singlet lens and {2% 33 p is composed of a front symmetrical double convex j 1309F 1542F 2765F 21711 lens element WhlCh is cemented to a rearward plano 1. 623X concave lens element. i1 i F .0942)? 3278? 4. A zoom type of an-amorphosing eyepiece for a 355% 35335 Si 133% 11231 mlcroscope comprlsmg 21 543x 2509B 03421 .4025F 0911F 35 a front relay lens system Wi'lICh collimates ll'lCOIIllng 014w 071317 image rays and has a front positive lens designated I and a rear positive lens designated II spaced rearwardly therefrom at an axial distance designated S mechanically compensated zoom type of pancratic 40 lens system which is located at an axial distance des- Although only a single specific form of the present inignated S rearwardly of said front relay lens sy vention has been shown and described in detail, other tent and has a range of magnification from high to forms are possible and changes y be made the low values in one meridian only lying perpendiculartails thereof and in the values of the constructional data W to a plane of unity magnification which includes With the ranges indicated wlthflmt departmg the axis of said eyepiece wherein all of the lens g i invemlon as defined m the appended clalms' surfaces are cylindrical and have their cylindrical e 0 arm: I e f 1. T arises;statistics? re e v ar i r i iii i phic mechanically compensated zoom type pailcl'atlc g Y g h nary! p08- lens system which works in collimated light and '1s lhlve mam W are P p composed of a plurality of optically aligned cylint Paving tW0 g e ens members WhlCh are drical lenses having the cylindrical surfaces thereof comcldtintally movabie dlfiefentlany with pf to all lying in the same direction symmetrically of a i l f y lenses lllsllch a lflannel' thfit an f l common plane which includes the optical axis of 15 formed 1n a substantially stationary axial position, i eyepiece, the foremost positive lens designated III being plano said anamorphic zoom lens system including two spaced convex i f d h other i i lens positive lens members which are stationary and furb d i d V being a i f closely spaced the? including two movable negative lens f f double convex singlets having their surfaces of I one negative lens being located between said positive 0 weakest curvature turned toward each other the lens members and the ot belng Spaced rearwardiy foremost of said negative lens members being desfrom the reafmost P member Sald ignated IV and being located between said positive n.egative. lens members bemg coincidentally i members III and V and the other negative member i zgi i zg g sgiggg 2 2252 5 zi sggz gi being designated VI and being located on the 0p m o 0 :ia ily fixed position, said image being transmitted at poslteb l v P member V m the negative unity magnification in said single plane and being h anamorphosed from 1x to at least 2.78 in a sec- Sald WD"? flirt P a Fear y lens Y ond plane which is perpendicular to said single plane, tem Whlch p f y a11gnd Wlth 531d relay 3 from relay spherical lens system which is optically 7 System and with said pancratic system to recelve paraligned with said zoom system near the front staallel light therefrom, said rear relay lens system tionary lens member and which collimates the light forming a real image at an axial distance S rearentering the last-named lens member, said relay syswardly thereof, and the last-named system having a tem being focused on a preceding image formed by front double concave singlet 1ens designated VII the objective of a microscope, WhICh is located at an axial distance 8; rearwardly plano convex singlet lens and a rear plano convex doublet lens having their convex sides turned toward from lens VI and having a rearward positive doublet lens designated VIII which is located at a distance S from lens VII,

variables S S S and S being given in the latter part of the table in chart form as follows:

F =1.369F F =2.544F the specific values of the focal lengths F to F of F:I= 722F vm the successive lens members I to VIII and of the Fm=956F S1=L0180F successive air spaces S to S when said lens members FIv=-291F S2= O63OF III to VI are all located in a position for producing FV='348F S5: 0O28F unity magnification being substantially as stated in FVI= 4441; S8=D024F the table hereunder wherein F designates the focal FVH=L466F S9:7625F length of the front relay lens system, 10

Magnification S3 Si Si 51 .99 .0309F .2542F 1936F .3000F FI=L369F S1=1'0180F 072; .0509F 2342b .2082F .2850F F =.722F S =.0630F 1.162X .0709F 2142F .2698F F 111:9 56F S3=-O3096F 1 1. 260x 09091 1942a sosF .2532F FIv='291F 842254? 0 1 aesx llOQF 1742F 23'7F O FV=-348F S5=-0028F 1. 493x 130% 1542a 2765F .2171F Ste-19361 l' as? as; are; FvII=1-466F S7=3000F 11938 1909F 0942F .3278F :1557F F =2.544F S .O024F 2. 122? 2109F 0742F .3595F 1340B S 7625F 2. 323x 2309B 0542F .3812F .1123F 9 2 543x 2509F .0342F 4025F .0911F 2 781X 2709s .0142F 4223B .o7i3F 5. A zoom type or" anamorphosing eyepiece for a microscope comprising a front relay lens system which collimates incoming 25 6. A zoom type of anamorphosing eyepiece for a microscope comprising a front relay lens system having a foremost planoimage rays and has a front positive lens designated I and a rear positive lens designated II spaced rear wardly therefrom at an axial distance designated S mechanically compensated zoom type of pancratic lens designated VIII which is located at a distance S from lens VII,

convex lens member and a rear convex-plano doublet lens member, said lens members being designated I and II respectively and being air spaced from each other at an axial distance S said relay lens system lens system which is located at an axial distance des- P conlstructed uillllmatfi the age rays emergignated S rearwardly of said front relay lens sysa g fig g ggfi gg g Zoom type of pancratic If 3:3 g ggs fj g iifig ggzz gg g lens system having a stationary convex-plano lens member designated III and spaced at a distance S to a Plane of uhlty magmficatlon Whlch Includes the rearwardly of lens II and optically aligned to receive axis of said eyepiece wherein all of the lens surparallel light th f faces are cylindrical and have their cylindrical axes a bl d bl concave l member d i t d 1V y g in Said pl ne f ni y magnification whereby which is spaced at a variable axial distance S from the image is anamorphosed, lens member III,

said pancratic lens system having two stationary posi- 40 a pair of closely spaced stationary double convex lenses tive lens members which are spaced apart, and furcompo ing a lens member which is designated Y ther having two negative lens members which are the Space therftbetweefl being designated 5 h Bald coincidentally movable differentially with respect to mehlbef V belhg Spaced at a Variable aXlal dlstahcfi the stationary lenses in such a manner that an image deslgnated 4 from lfins member IV, is formed in a substantially stationary axial position, a double Concave m e lens member ieslgnated VI the foremost positive lens designated III being plano located at a f anal dlstance S6,1earWaF l1Y 9 convex in form and the other positive lens member member 1 stanoglary g i ii i designated V being a pair of closely spaced double 5314:; an Sal mova e mem ers emg mega we m convex singlets having their surfaces of weakest the lensmembers In to VI being characterized by curvature f toward each h fommost cylindrical surfaces lying in a single direction, said of sald negatlve lens members being dFslgnated IV movable members being coincidentally moved difand being located between said posite members ferentially with respect to said stationary members II and V and the other negative member being in such a manner as to form a stationary image which ingated VI and being loaded on the pp side of may be anamorphosed between magnifications of 1.1 positive member V from the negative member IV, to 2.78 in an axial plane normal to said single said eyepiece further comprising a rear relay lens sysaxial plane,

tern which is optically aligned with said front relay said eyepiece further comprising a rear relay lens syssystem and with said pancratic system to receive tem having a focal lengthsubstantially equal to said parallel light therefrom, said rear relay lens sysfrom relay systemhhd is Optically aligned t0 receive tem f i a real image at an axial distanm 5 parallel light coming from said pancratic lens sysrearwardly thereof, and the last named System haw tem, said rear relay lens system forming arealrmage ing a front double concave singlet lens designated VII at Stanonary focal Plane located at an axlfll dlstance which is located at an axial distance S rearwardly geslgmted S9 l thereof haying a from from lens VI and having a rearward positive doublet on e Concave smg 6t ens VII whlch 1s Spaced at an axial distance designated S from a rearward positive doublet lens VIII,

and lens means optically aligned for viewing said real image, the successive refractive surfaces of said lens members the specific values of focal lengths F to F of the successive lens members I to VIII being given herebelow along with the specific values of the successive air spaces S to S when the lens members III to VI are located in their respective positions for producing a series of image magnifications from unity to 2.78 in said anamorphosing plane, the values for I to VIII being designated R to R and their axial thicknesses between said surfaces being designated successively t to 2 wherein the minus sign used with the R designations signifies surfaces which are concave toward the front of said system,

the specific values of R to R t to I and S to S 7. Azoom type of anamorphosing eyepiece for amicrobeing given in the table of mathematical statements scope according to claim 6 further characterized by herebelow in terms of F which is the focal length the specific absolute values of the refractive index n 1 For unity magnification.

of said front relay lens system, Abbe number 1 being given in the table herebelow R LANO t O70F 5 respectively by the designation n (I) to n;, (VIII) and 1 to V R =.447F t =.030F n (I)=1.700 v (I)=48.0 -R =.331F t =.030F n (II pos.)=1.620 v (II pos.)=6O,3 R =PLANO t =.030F n (II neg.)=1.621 II (II neg.)=36.2 R :.623F r =.030F 10 n (III)=1.651 v (III)=58.4 R =PLANO t-,=.028F n (IV)=1.720 v (IV)=42.0 R =.727F t =.060F n (V front)=l.623 1/ (V fr0nt)=56.9 R =.299F t =.092F 11 (V rear)=1.623 v (V rear)=56.9 R =2.000F t =.120F "n R 563F t 4 (VII)=1.651 y (VII)=58.4

R 55F s z o g n (VIII p0s.)=l.5l4 1/ (VIII pos.)=70.0 =1 152F S 063 n (VIII neg.)=1.75l 1 (VIII neg.)=27.8 -R 1.663F S =.O3096F 1 R =402F S =.2542l; 00 References Cited R =1.890F S =.0028 RH=1 890F S6=J936F1 UNITED STATES PATENTS 00 1 2,500,017 3/1950 Altman 350l81 R19= 738F 3 302411 2,924,145 2/1960 Landeau 350-181 R =PLANO S =.7625F 25 JOHN K. CORBIN, Primary Examiner,

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,410,629 November 12, 1968 Vance J. Carpenter et a1.

It is certified that error appears in the above identified patent and that said Letters Patent are hereby corrected as shown below:

Column 3, line 48, ".Z76F F .306F" should read .276F F .306F line 50, ".422F F .466F" should read .422 F -F .466F line 51, ".927OF t .033OF" should read .027OF t .033OF Column 7, lines 53 and 54, "members II and V" should read members III and V Column 8, in the table, fourth column, line 4 thereof, cancel [.2003F]"; same table, fourth column, line 6 thereof, cancel "[.2179P]".

Signed and sealed this 24th day of March 1970.

(SEAL) Attest:

EDWARD M.FLETCHER,JR.

Attesting Officer Commissioner of Patents WILLIAM E. SCHUYLER, JR. 

